Question

решите 2 примера:
4a + 1-4a^2/a,
a+b/a-b - a-b/a+b

Answer 1

4a + (1-4a^2)/a=(4a²+1-4a²)/a=1/a

(a+b)/(a-b)-(a-b)/(a+b)=[(a+b)²-(a-b)²]/(a²-b²)=
=(a+b-a+b)(a+b+a-b)/(a²-b²)=2b*2a/(a²-b²)=4ab/(a²-b²)